The mode line can display various faces, if the strings that control
it have the @code{face} property. @xref{Properties in Mode}. In
addition, the face @code{mode-line} is used as a default for the whole
-mode line (@pxref{Standard Faces}).
+mode line (@pxref{Standard Faces,,, emacs, The GNU Emacs Manual}).
@table @code
@cindex percent symbol in mode line